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ERK1/2-Akt1 crosstalk regulates arteriogenesis in mice and zebrafish.

Authors
  • Ren, Bin
  • Deng, Yong
  • Mukhopadhyay, Arpita
  • Lanahan, Anthony A
  • Zhuang, Zhen W
  • Moodie, Karen L
  • Mulligan-Kehoe, Mary Jo
  • Byzova, Tatiana V
  • Peterson, Randall T
  • Simons, Michael
Type
Published Article
Journal
Journal of Clinical Investigation
Publisher
American Society for Clinical Investigation
Publication Date
Apr 01, 2010
Volume
120
Issue
4
Pages
1217–1228
Identifiers
DOI: 10.1172/JCI39837
PMID: 20237411
Source
Medline
License
Unknown

Abstract

Arterial morphogenesis is an important and poorly understood process. In particular, the signaling events controlling arterial formation have not been established. We evaluated whether alterations in the balance between ERK1/2 and PI3K signaling pathways could stimulate arterial formation in the setting of defective arterial morphogenesis in mice and zebrafish. Increased ERK1/2 activity in mouse ECs with reduced VEGF responsiveness was achieved in vitro and in vivo by downregulating PI3K activity, suppressing Akt1 but not Akt2 expression, or introducing a constitutively active ERK1/2 construct. Such restoration of ERK1/2 activation was sufficient to restore impaired arterial development and branching morphogenesis in synectin-deficient mice and synectin-knockdown zebrafish. The same approach effectively stimulated arterial growth in adult mice, restoring arteriogenesis in mice lacking synectin and in atherosclerotic mice lacking both LDL-R and ApoB48. We therefore conclude that PI3K-ERK1/2 crosstalk plays a key role in the regulation of arterial growth and that the augmentation of ERK signaling via suppression of the PI3K signaling pathway can effectively stimulate arteriogenesis.

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